Conditions affecting the orbital floor or inferior oblique muscle may mimic Brown's syndrome. These need to be excluded when evaluating a patient with possible Brown's syndrome.
Differential diagnosis of pseudo-Brown's syndrome:
(1) congenital defect of the inferior oblique muscle or tendon
(2) acquired defect of the inferior oblique muscle or tendon
(3) fracture of the orbital floor
(4) congenital or acquired adhesions in the lower and/or posterior orbit
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